はりがねわらび (針金蕨) [Index] [Back] わが国の本州から四国・九州、それに台湾や朝鮮半島、中国に分布しています。林内や林縁にふつうに生え、高さは５０〜８０センチになります。葉柄は長さ２５〜３５センチで細くて硬く、赤褐色をしています。葉身は緑色から淡緑色で、長さ３０〜３５センチ、三角状長楕円形で２回羽状深裂して、先端がが尖ります。羽片は披針形で、先が尾状に尖り、１０〜２０対がつきます。最下羽片がやや下向きに「ハの字」に開いてつくのが特徴です。台湾華語では「栗柄泛亞金星蕨」、中国語では「光脚金星蕨（guang jiao jin xing jue）」と呼ばれます。  ヒメシダ科ヒメシダ属の夏緑性シダ類で、学名は Thelypteris japonica (syn. Parathelypteris japonica)。英名はありません。  The "Harigane-warabi" (Thelypteris japonica) belongs to the family Thelypteridaceae. It is a summer-green fern that is distributed from Honshu to Shikoku and Kyushu in Japan, as well as Taiwan, the Korean Peninsula and China. It grows commonly in forests and along the edges of forests, and is 50 to 80 cm tall. The leaf stalk is 25 to 35 cm long, thin and hard, and reddish brown in color. The leaf blade is green to light green, 30 to 35 cm long, triangular-oblong in shape, and twice pinnately parted, with a pointed tip. The pinnae are lanceolate, with a caudate apex, and there are 10 to 20 pairs. The lowest pinna is slightly turned downwards and opens in an inverted v shape. In Taiwanese, it is called "栗柄泛亞金星蕨", and in Chinese, it is called "光脚金星蕨" (guang jiao jin xing jue).  宮城県村田町「浮島の植物群落」にて、2024年08月22日撮影。  Shu Suehiro shu@botanic.jp